![]() ![]() The certificates encrypt messages through 2048-bit RSA signature key and 256-bit symmetric encryption. The SSL certificates help users to conduct a secure email communication between the Exchange server accounts. Importance of SSL Certificates in Exchange Server In such situations, Outlook shows error and cannot connect to proxy server. Sometimes, rather than from any trusted authority, the SSL certificate is self-signed. The SSL certificate makes a secure connection as Outlook makes connection with the Exchange server through HTTPS request. The connection between the Outlook and Exchange server is validated with the help of the SSL certificates. ![]() In this article, we will discuss the error code 8 Microsoft Outlook unable to connect to proxy server and how to get rid of the error. But sometimes Outlook users face errors in accessing their important mailbox data. (so it looks like it's more a problem of the Exchange server than of the client side, as that Outlook can connect to a different mailserver (Exchange 2010) just fine.Microsoft Outlook is a popularly known and used email service provider around the globe. I have tried a Outlook 2013 installation on another PC (not the terminalserver) - same problem. This prompts me for my user credentials, but then stops with the same error message. I have also tried to configure Outlook to connect to the server via RPC over HTTP, setting authentication to "Basic". Accessing the mailboxes via OWA works just fine, it's just Outlook that doesn't want to connect. I have disabled the firewall on the DC completely for all networks. ![]() Opening a web page to works fine, the cert gives no errors. The alternative names include dc1.ks.local (for the DC/Exchange server). C:\Users\Administrator\AppData\Roaming\ClassicShell\Pinned>Get-ExchangeCertificate | Select Subject,IsSelfSigned,Se rvices | ft -auto Subject IsSelfSigned Services - CN=, OU=PositiveSSL Multi-Domain, OU=Domain Control Validated False IMAP, POP, IIS, SMTP CN=Microsoft Exchange Server Auth Certificate True SMTP CN=DC1 True IIS, SMTP CN=WMSvc-DC1 True None you must connect to microsoft exchange with the current profile before you can synchronize with your outlook data file (.ost)Ĭreated a public SAN certificate for the Exchange server: Setting up an Outlook profile is no problem at all, the names resolve just fine, but when I open Outlook the first time I get this error message:Ĭannot start microsoft outlook. I have set up a completely new system, Server 2012 as the DC with Exchange 2013 installed, and another Server 2012 as a member of that domain acting as a terminalserver with Outlook 2013 installed. ![]()
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